Note: Please soak the product in water for about an hour before use.(Foam is obviously good. This product is made of glass, so please handle with caution. Please connect the tube tightly. Please be careful when overheating. Please clean it regularly.(Soak unscented chlorine bleach overnight and wash thoroughly. If the air bubbles are reduced, please clean the bubble pad and use it repeatedly.(If it gets stuck with moss or dirt on the diffuser, the diffusion efficiency will be reduced. 1. Make sure that the diffuser is completely submerged in full water. 2. Inspects the joints to eliminate the cause of air leakage in the connection part. 3. Didnt open the valve on the Co2 tank. 4. There is no CO2 (this can be seen from a pressure gauge, if the facility does not have CO2, the pressure gauge guide will be reset to zero.5. The power of the air pump may not be sufficient. 6. If air bubbles are reduced, please clean the moss and dirt attached to the diffuser.